Copyright 1997, 2001 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Cygnus Solutions.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
#ifndef OBJALLOC_H
#define OBJALLOC_H
#include "ansidecl.h"
that the object will want to allocate space as it goes along, but
will never want to free any particular block. There is a function
to free a block, which also frees all more recently allocated
blocks. There is also a function to free all the allocated space.
This is essentially a specialization of obstacks. The main
difference is that a block may not be allocated a bit at a time.
Another difference is that these routines are always built on top
of malloc, and always pass an malloc failure back to the caller,
unlike more recent versions of obstacks. */
refer to these fields, nor should they allocate these structure
themselves. Instead, they should only create them via
objalloc_init, and only access them via the functions and macros
listed below. The structure is only defined here so that we can
access it via macros. */
struct objalloc
{
char *current_ptr;
unsigned int current_space;
void *chunks;
};
struct objalloc_align { char x; double d; };
#if defined (__STDC__) && __STDC__
#ifndef offsetof
#include <stddef.h>
#endif
#endif
#ifndef offsetof
#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
#endif
#define OBJALLOC_ALIGN offsetof (struct objalloc_align, d)
extern struct objalloc *objalloc_create (void);
fails. */
extern void *_objalloc_alloc (struct objalloc *, unsigned long);
gcc, because otherwise we would have to evaluate the arguments
multiple times, or use a temporary field as obstack.h does. */
#if defined (__GNUC__) && defined (__STDC__) && __STDC__
does not implement __extension__. But that compiler doesn't define
__GNUC_MINOR__. */
#if __GNUC__ < 2 || (__NeXT__ && !__GNUC_MINOR__)
#define __extension__
#endif
#define objalloc_alloc(o, l) \
__extension__ \
({ struct objalloc *__o = (o); \
unsigned long __len = (l); \
if (__len == 0) \
__len = 1; \
__len = (__len + OBJALLOC_ALIGN - 1) &~ (OBJALLOC_ALIGN - 1); \
(__len <= __o->current_space \
? (__o->current_ptr += __len, \
__o->current_space -= __len, \
(void *) (__o->current_ptr - __len)) \
: _objalloc_alloc (__o, __len)); })
#else
#define objalloc_alloc(o, l) _objalloc_alloc ((o), (l))
#endif
extern void objalloc_free (struct objalloc *);
recently allocated blocks. */
extern void objalloc_free_block (struct objalloc *, void *);
#endif
